Microscope-condenser.



H. SIEDENTOPF.

MICROSCOPE CONDENSER...

APPLICATION FILED Auem. 1914.

1,157,257. Patented Oct. 19, 1915.

v ms,

urrespumis w th size step. The result s0 0 11-- len 'ine darli-ga'ound out 015 the field of View of grown image, the ill-is diaphragm e"; closed. so far that 01113 are of use for the 1ighton can enter the condensar,

inv-ea dan ers 111mm e ncsity at" the Eight-ground I be dxrectly ad usted my the i111- nt at @he handle in the usual As morecver with the light-W011i 'tance,

and the so being thus frequentiy he advantage, 1; effecied, itha Obie moving oojsct 0% view the 1 In the annexed drawing there is shown as a constructional exampleiof the invention a. twomembered lens condenser with a darkground stop capable of being rotated to the side. 1 y

Figure 1' is a longitudinal section, Fig. 2

a cross-section on line 2-2 of Fig. 1.

f reaches through a plate (Z fixed in the top ground stop 0.

"in the condenser casing .'=ring e ofthe'iris diaphragm e is rotated vIn a condenser casing a two condenser lenses 6 and b are mounted. In front of them and carrying the dark-groundstop 0 there is first of all a glass plate 0 which .is rotatable along with a disk 0 containing it about a fixedrjournal ct'i, and a second glass of a box (1 which is fitted in the condenser casing, and carrying in the middle a cemented on disk d of smoked glass. .As it is assumed, that parallel rays pf light: are transmitted to the condenser, this disk There is further built into the condenser an iris diaphragm e, the mount c of which is held by its flange e? along with the box d by meansof a screwed in'ring a a. I The movable y means-of a projectingpiece '6 which slot in the mount a and to which a setting lever f reaching through corresponding slots in the condenser casing aand the box 61 is fixed by means of two screws 1. The same screws-7 fix to'the projecting piece 0* of themovable iris diaphragm ring e a small box 9 containing a catch 1' having a cone-shaped point i, which catch is guided in the said box and is pressed upward by a helical spring h. In order to' -rfake a rotation possible, the top of the box.

"d hasa slot d in which the box 9 can move.

,set for dark-ground illumination,

The catch i engages by means of its point i with a depression a in a lateral flange of the disk 0 and thus causes, on the setting lever f being turned, the disk 0 to be carried along with it, the said disk rotating about the jourthe side. v With the setting lever 'f in the position the"'c5ndenser is marked I in'the drawing the iris open and the dark operative, central polever 7 being turned diaphragm e is quite ground stop a is in its into the position 11, shown by dotted lines,

the iris diaphragm e closes down to the ampunt corresponding to the dark-ground stop a, and at the same-time thesaid stop is rotated by the catch 2 by about the amount has the same size as the darknal c and moving. the dark-ground stop 0 U1 of its diameter to the side, so that now the condenser is set for light-ground illumination. With this setting the disk occupies the position as shown in dotted lines in Fig.

The luminosity of the light-ground by the smoked glass disk catch slips, on account of its point 2' being conical, out of the recess 0 and slides over becomes eiiective, by the- On the setting the disk 0 so that the dark-ground stop remains in its turned-back position, without preventing the further setting of the iris diaphragm. i

I claim: I

1. In a microscope'condenser adapted for .both dark-ground illumination and light ground illumination a central stop for use with the former kind of illumination, an iris diaphragm for use with the latter kind of illumination and'a handle adapted to operate the said diaphragm and adapted also to render the said stop operative and inoperative.

E2. Ina microscope condenser adapted for both dark-ground illumination and lightground illumination a central stop for use diaphragm for use with the latter kind of illumination, a handle adapted to operate the said diaphragm and means for rendering the said stop operative and inoperative,

comprising means for releasably coupling the diaphragm and the stop in such a man ner that, on-the stop reaching its inoperative position, the diaphragm aperture corresponds to the size of the stop.

8. In a microscope condenser adapted for both dark-ground illumination and lightground illumination a central stop for use with the former kind of illumination, an iris diaphragm for use with the-latter 'kindofi the stop, adapted to become oper withthe former kind of illumination, an iris 

